This is just spam. It provides no value in the form of describing how you got the 50k users and is basically just an ad. Flagged.
Not sure why this was flagged but I am happy to provide video evidence and even show it live on a call if that makes you feel at ease
There is a reason it grew quickly. You could have provided value by diving into the ways (word of mouth, articles being written about you, etc).
Or if you had just done a normal show HN and described your product, it wouldn't have come across as spam.